Hi there, I had the same problem (no LPC810 support) and was very delighted to see there is a new version. I did some testing but did not get it working. I have the lpc800-mini-kit.
Here is what I found:
ls -l /dev/cu.* /dev/tty.*
crw-rw-rw- 1 root wheel 18, 3 30 jun 00:11 /dev/cu.Bluetooth-Modem
crw-rw-rw- 1 root wheel 18, 1 30 jun 00:11 /dev/cu.Bluetooth-PDA-Sync
crw-rw-rw- 1 root wheel 18, 9 6 jul 10:05 /dev/cu.usbserial-A600K1PQ
crw-rw-rw- 1 root wheel 18, 2 30 jun 00:11 /dev/tty.Bluetooth-Modem
crw-rw-rw- 1 root wheel 18, 0 30 jun 00:11 /dev/tty.Bluetooth-PDA-Sync
crw-rw-rw- 1 root wheel 18, 8 6 jul 10:05 /dev/tty.usbserial-A600K1PQ
My serial device (usbserial-A600K1PQ) should be COM 6.
But when I try to connect (tools > terminal) with this port I get "Unable to communicate. (in use) Ensure no other...."
I have tried COM ports 1 to 8 and got the same result.
The connection is good when I connect to the serial device with bash command "screen"
screen /dev/tty.usbserial-A600K1PQ
After a reset on the lpc800 i get: Hello World!
I use OS X version 10.7.5.